Hopeful new 1250 GSA'er
Join Date: Aug 2019
Location: Lower mainland BC, Canada
Ongoing fluctuations in coolant temperature readout
just a recheck with people to see if they've encountered this anomaly in the readout of their coolant temperature, to see if anyone else has experienced it,
I was having a problem in which the temp readout on my 2019 1250 GSA would, during rides at constant speed ( ~ 110 km/h, 70 ish mph) in mid-range ambient temps. (~ 12 - 15C, or 50s to 60s F) fluctuate between 78 and 98 C (~ 173 to 208 F) rather wildly - that is it would climb from mid-range to the max of 97 or 98C, in jumps of 3 to 5C, then drop right away in similar large steps down to 78C, and then shortly aftert it would repeat this,
interestingly, it doesn't do this during stop-and-go heavy traffic and lots of intersections, here the coolant temp just climbs slowly as expected to ~ 100C (212F) and then the fan comes on and it goes down, then repeats as long as I'm going slowly. So that behaviour makes sense and seems appropriate.
So this significant fluctuation in larger steps just seems to occur when moving quickly when there's lots of air movement over the radiators.
I have now taken the bike to the dealer who thought it odd, and replaced the coolant sensor and did an "Adaptive Value Reset" to force the computer to relearn ambient and moving data,
however I now have to report to them (and you lot!) that this hasn't corrected the fluctuations, they still occur,
so I am wondering if folks here can rationalise this fairly cyclic fluctuation in terms of (normal?) opening/closing of the thermostat -controlled flow of coolant to/from the radiator where there's lots of cooling air available? Does this up/down temp readout make sense to anyone?
am I just seeing the sensitive readout of a normal cooling system experiencing good cooling airflow over the radiator? some of the jumps in temp (and similarly, drops) are quite large - 5 - 6 degrees in one step - i.e., it hops up or down from something like 83 to 89 in one go, not more gradually . . .
Given the season here in Canada right now, I can't report on a hwy ride at 30 - 35C (86-95F) say, to see what happens there, but my wife and I will be riding down hopefully to Arizona next week so maybe that will be a bit warmer than here!
I get no apparent effects on the engine itself, and no warning lights or screens, all I see apparently wrong or at least "odd" is the rate and step-size of coolant temp fluctuation,
cheers, thanks folks for reading this, otherwise I'm not really getting anywhere,
despite my need to understand this, I may wind up having to ignore it . . . it's just that temp changes like this make me worry about longterm effects on the engine, but then I suppose that if the temps aren't out of range, do I care?
Last edited by pmariana; 08-Oct-2019 at 12:05 PM (712).